//Benke PDF. C10 p26.
#include <stdio.h>
struct student
{
    int num;
    int age;
};
int main()
{
    struct student st[3] = {1000, 20, 2000, 19, 3000, 23};
    struct student *p;
    p = st; //p指向结构体数组首元素
    printf("%d\n", ++p->num);
    //改成(*++p).num? 2000
    //或printf("%d\n", p++->num);
    //改成++p->num? 1001
    return 0;
}